Looper mechanism for sewing-machines.



5L2 'W g J. P. WEIS.

LOOPEB MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC. 26, 1912.

1,094,353. I Patented Apr.2'1, 1914.

2 SHEETS-SHEET 1.

WITNESSES I R ATTORNEY J. P. WEIS. LOOPEB MECHANISM FOR. SEWING MACHINES.

' APPLIOATION FILED DEC. 26, 1912. 1 094 353 Patented Apr. 21, 1914.

2 sums-811E111: 2

WITNESSES ATTORNI UNITED s'rArns PACIENT OFFICE.

JOHN P. WEIS; 0F NYACK, NEW YORK, ASSIGNOB=-TO-LUCIUS N. LITTAUER, OF

' GLOVERSVILLE NEW YORK.

LOOPER MECHANISM FOR SWING-MAQHINES.

Patented Apr. 21, .1914.

Application flied December 26, 1312. Serial No. 738,540.

To all whom z't-may concern:

Be it known that I, JOHN P. Wnrs, a citizen of the United States, residing at Nyack, in the county of Rockland and State of New York, have invented certain new and useful Improvements in Looper Mechanism for' Sewing-Machines, .of which the following is a specification.

This invention relates to sewing machines, and more particularly to the stitch mechanism thereof, and has for its object the provision, in a multiple needle machine in which one or more rows of double chain stitches may be made at the same time, of

improved looper mechanism the loopers of which carry threads cooperating with the threads of the needlesin such manner as to produce the well known two-thread chain stitch.

An object of the invention is the provision of a multiple or gang needle machine for making parallel rows of double chain stitches in which the needles may operate close to or far apart from one another to make the rows of stitches close to one another or far apart.

Another object is the provision of a machine which will permit the use of very short loopers having a very short travel to permit them to operate very close to one another.

Another object is the provision of stitching mechanism capable of high speed and of a wide range of adjustment, and in which the working elements have comparatively short movements to enable the use of the well known auxiliary devices and attachments to surround and be positioned very close to the loopers and feeds, which has been heretofore very difficult, if not impossible, with the long-throw loopers, which in terfered with the feeds, rufliers and other.

ing downward; Fig. 4 is a similar view showing the needles moving upward and the parts in a different position from that of Fig. 3; Fig. 5 is a detail of the looper-shaft crank; .Fig. 6 is a front view of Fig. 5; Fig. 7'1llustrates detail views of the looper; Fig. 8 illustrates detail views of the looper, we die and throat plate; Fig. 9 illustrates views simllar to Fig. 8, but'showing the needle descending and passing through a loop of the looper thread; Fig. 10 illustrates views similar to Fig. 9, but showing the needle in its raised position; and Fig. 11 illustrates diagrammatically the path of movement of the loopers.

Similar characters of reference indicate corresponding parts throughout the different figures of the drawings.

The base plate 1 of the machine carries a looper bracket 2 attached thereto by screws 3. This bracket 2 has a pair of upwardly extending arms 4 and 5 at opposite ends, in which is journaled the looper shaft 6 for lengthwise and swinging or rocking movements. -On the shaft 6 are located loopers 7 and 8 provided with the usual thread eyes tapped to receive the ball stud 14 connected with the crank rod 27, while the arm 12 is formed to receive the ball stud 15 which has connected to it a socket joint 16 which terminates in an eccentric strap 18 provided with a two-part cap 19; A ball eccentric '22 operates within this capped strap and terminates in a collar 23 secured to the driving shaft 20. By this means the loopers are rocked from the back to the front of the needles so as to enter the needle loops while the needles are ascending and to move over to a position where the needles will 00-- operate with the back of the loopers so as to enter the looper loops 24.

Connected with the ball stud 14 is the socket joint 26, which is, by means of a rod 27, connected to a similar socket joint 28 connected by means of a ball stud 29 to a suitably supported dove-tail slide 30. This in Fig. 9,. from which it will be seen that the needle passes between the looper and its thread 24, while the needle loop 36 is drawn back by its looper out of the path of the needle until the needle point is sufiiciently below the looper to prevent it from plercing this loop 36 which surrounds the looper. When the needle 34 is in the position shown in Fig. 9 the conical rolls 31 are engaged by a certain portion of the cam 32, whereby the loopers will be quickly withdrawn from the needle loop. The needle continues its descent while the looper remains in its backward position, at which time the eccentric 22 turns to the position shown in Fig. 4, thereby rocking the loopers 7 and 8 to the back of the needles. At this time the needles have again commenced to rise until a loop of the needle thread has been deflected, at which time the conical rollers 31, in engagement with another part of the cam 32, quickly move the loopers into the needle loops, remaining in such position practically without movement until the needles have reached their highest position and again move downward until the needle point is very close to the top of the looper, as shown in Fig. 10, thus completing the formation of the stitch. It will be seen from Fig. 2 that as the loopers are moved so as to enter the needle loop the eccentric connection 18 swings on the ball eccentric 22, having the center of said eccentric as an axis for movement so that the ball of ball stud 15 is caused to travel in the arc of acircle, represented by the distance from the centers 37 and 38 (Fig. 4) so that the loopers are moved in a path that may be termed a concave-convex path 39 and 40 (Fig. 11) which represents the loop taking and giving'movements of the looper, While the radius 41 and 42 represents the movement of the eccentric 22 and the eccentric strap 18 which rocks the loopers from one side of the needles to the other. a

In addition to the advantages enumerated in the objects of the present improvement, it may also be said that there is a material advantage in having the loopers move forward to their loop-taking position and then away from the needles, or backwardly m a concave path as shown herein, so as to miss speed which I obtain by the present imthe adjacent needles, for the reason that in a machine of the kind disclosed it is usual to use two or more needles, and as these needles are close to one another it is very essential that the independent loopers cooperate with the individual needles in such a manner as'to take the needle loops and deliver looper loops without interference with other needles, and this can be done in a superior manner by the organization presented, in which the loopers move in a con-,

cave-convex path.

In the present improvement, by reason of the construction of cam and rolls 31 for operating the looper .slide, in which it will be'observed that the rolls operate on each side of the cam, the sliding friction is overcome, as these rolls always turn in the same vdirection, thus avoiding'heating and wear. With the usual cam and cam roll, the latter operating in a groove, the roll first turns one way as it rubs on one side of the cam and then reverses when it turns on the opposite side of the cam, so that at high speed there is a tremendous amount of slipping or rubbing friction, which generates great heat, even to the extent of causing the lubricating oil to bubble or boil, whereas by means of the present improvement this is practically overcome.

From the foregoing it will be seen that the reciprocating looper shaft is located, as stated, in parallelism with the driving shaft and that the loopers have the shanks thereof extending in a plane transverse to the plane of the driving shaft and therefore of the looper shaft. In other words, the driving shaft and the reciprocating looper shaft are located in a horizontal plane while the shanks of the looper are located in a-vertical plane, and in the present instance the loopers work entirely below the throat plate of the machine and in a plane which is vertical to theplane of the driving shaft and of the looper shaft, instead of in the same plane therewith. It will also be observed that the cam rolls connected with the slide 30 are conical rolls as hereinbefore stated and that the cam 32 is not of uniform thickness. By reason of the non-uniform thickness of the cam and the conical formation of the rollers I am able to obtain extremely high speed andobviate the necessity of any intermediate movablev connection between the cam rollers and the slide, and consequently the point of contact of the cam rollers to the cam does not vary at any time and there is no slippage of the rollers relatively to the cam which would interfere with the high provement.

I claim as my invention:-

1. In a sewing machine, the combination ofa driving shaft, a reciprocating'and rocking looper shaft located in parallelism with the driving shaft, a and means connecting the looper shaft with the driving shaft for shifting said looper in a concaveconvex path.

2. In a sewin machine, the combination ofa driving shaft, ing looper shaft located in parallelism with the driving shaft, a looper carried thereby, and means connecting the looper shaftwith the driving shaft for shifting said looper in a concave-convex path and including a slide and means for shifting it.

3. In a sewin machine, the combination ofa driving shaft, a reciprocating and rocking looper shaft, a 100 er carried thereby, and means connecting t e looper shaft with the driving shaft and comprising a slide, and means for shifting it and an endwise reciprocating connecting rod between said slide and looper shaft and having pivotal connection with said parts.

4. In a sewing machine, the combination of a driving shaft, a reciprocating and rocking'looper shaft, a looper carried thereby, an eccentric and ball ]oint connection between said driving shaft and looper shaft, a slide, means connecting it with the looper shaft, and means carried by the driving shaft for reciprocating said slide thereby to rock and reciprocate the looper shaft.

5. In a sewing machine, the combination of a driving shaft, a reciprocating and rocking looper shaft, a plurality of loopers carried thereby, an eccentric and ball joint connection between said driving shaft and looper shaft, a slide, means connecting it with the loo-per shaft, and means connecting said slide with the driving shaft whereby the looper shaft is rocked and reciprocated lengthwise and the loopers moved in a concave-convex path.

6. In a sewing machine, the combination of a driving shaft, a reciprocating and rocking looper shaft, a looper carried thereby, a two-armed crank carried by said looper shaft, meaiis connecting one arm thereof with the driving shaft at one point, and means connecting the other arm thereof with the driving shaft at another point for reciprocating and rocking said looper shaft.

7. In a sewing machine, the combination of a driving shaft, a reciprocating and rocking looper shaft, a looper carried thereby, a tw0-armed crank carried by said looper shaft, means connecting one arm thereof with the driving shaft and constructed'to shift the looper in a concave-convex plane,

and means connecting the other arm thereof with the driving shaft and including a sliding member for reciprocating said loo-per shaft.

' 8. In a sewing machine, the combination of a driving shaft, a reciprocating and rocklo'oper carried thereby,

a reciprocating and rock ing looper shaft, a plurality of loopers car-. ried thereby, a two-armed crank carried by said looper shaft, an eccentric and ball jointconnection between one of the arms thereof and said driving shaft, acam carried by said drivingshaft, a slide mounted adjacent thereto and carrying means adapted to engage with said cam, and means connectin said slidewiththe other arm of said cran thereby to reciprocate said looper shaft.

9. In a. sewing machine, the combination of a driving shaft, a reciprocating and rocking looper shaft, a plurality of loopers car- -ried thereby, a two-armed crank carried by said looper shaft, an eccentric and ball. joint connection between one of the arms thereof and said driving shaft, a cam carried by said driving shaft, a slide mounted adJacent thereto and carrying a pair of cam rolls adapted to engage with said cam, and means connecting said slide with the other arm of said crank thereby to reciprocate said looper shaft.

10. In a sewing machine, the combination of a driving shaft, a reciprocating and rocking looper shaft, a looper carried thereby, means connected with the driving shaft for rocking said looper shaft, and means connected with the driving shaft for reciprocating said looper shaft and comprising in part a slide, a cam carried by the driving shaft and a pair of cam rolls carried by said slide.

11. In a sewing machine, the combination of a driving shaft, a looper shaft, one or more loopers carried thereby, a two-armed crank carried by said looper shaft, means connecting one arm thereof with the driving shaft for imparting a predetermined movement to said looper shaft, and means connecting the other arm of said crank with the driving shaft for imparting a different movement to said looper shaft.

12. In a sewing machine, the combination of a driving shaft, 21 looper shaft, one or more loopers carried thereby, a two-armed crank carried by said looper shaft, means. connecting one arm thereof with the driving shaft for imparting a predetermined movement to said looper shaft, and means connecting the other arm of said crank with the driving shaft for imparting a different movement to said looper shaft, said last means including a slide and cam actuated means for shifting said slide.

13. In a sewing machine, the combination of a driving shaft, a looper shaft, one or more loopers carried thereby, a two-grmed crank carriedby said looper shaft, and separate means connecting each ofthe arms of i said crank with the driving shaft, one of said means comprising an eccentric ball joint connection and the other a cam actuated slide.

14. In a sewing machine, the combination of a driving shaft, a reciprocating and rocking looper shaft, one or more loopers carried thereby, a two-armed crank carried by said looper shaft, an eccentric and ball joint connection between one of the arms of said crank and the driving shaft, a cam actuated slide connected with said driving shaft, and a ball joint connection between said slide and the looper shaft.

15. In a sewing machine, the combination of a driving shaft, a looper shaft, one or more adjustable loopers carried by said shaft, a two-armed crank carried by said looper shaft, and means connecting the arms of said crank with the driving shaft for rocking and reciprocating the loopers.

16. In a sewing machine, the combination of a driving shaft, a looper shaft, one or more adjustable loopers carried by said shaft, a two-armed crank carried by said looper shaft, and means including a cam actuated slide connecting the. arms of said crank with the driving shaft for rocking and reciprocating the loopers.

17. In a sewing machine, the combination of. a driving shaft, a reciprocating and oscillating looper, and means including a single spherical eccentric connecting saidlooper with the driving shaft for shifting said looper into a concave-convex path.

18. In a sewing machine, the combination of a driving shaft, a reciprocating and oscillating looper, and means connecting said looper with the driving shaft and in cluding a spherical eccentric, a slide and a cam for shifting said slide.

19. In a sewing machine, the combination of a driving shaft, a reciprocating and oscillating looper having its forward and return movements in different paths, and

' means connecting said looper with the driving shaft and including a cam, a cam operated slide, a pair of rolls coiiperating with said cam and means for actuating thecam.

20. In a sewing machine, the combination of looper mechanism including a looper movable in transverse directions with its forward and return movements in different paths, and means for shifting said looper and including a slide, a pair of rolls connected therewith, and means for reciprocating said rolls.

21. In a sewing machine, the combination of loo-per mechanism including a looper movable in transverse directions, with its forward and return movements in different paths, a cam, a cam operated slide for shifting said looper, and a pair of rolls connected with said slide and cooperating with said cam.

22. In a sewing machine, the combination of a driving shaft, looper mechanism including a looper supported for movement in transverse directions, and means connecting the looper with the driving shaft and including a slide, a pair of conical rolls carried thereby and a cam mounted on said driving shaft and workin between said 'rolls and effective to drive t e same always in the same direction.

23. In a sewing machine, the combination of a driving shaft, looper mechanism including a looper, means for operating it and including a slide sliding in a straight path only, a'pair of rolls carried thereby, and a cam carried by said driving shaft and working between said rolls for always driving the rolls in the same direction.

24. In a sewing machine, the combination of a driving shaft, looper mechanism including a looper, and means connecting said looper with the driving shaft and including a pair of rolls and a cam working between said rolls for always driving them in the same direction, said rolls and cam having an unvariable position relatively to each other.

25. In a sewing machine, the combination of looper mechanism including a looper and driving means therefor comprising a pair of conical cam rolls carried thereby, a cam cooperating with said rolls and means for rotating said cam.

26. In a sewing machine, the combination of a driving shaft, a reciprocating and rocking looper shaft extending in parallelism therewith, a looper carried thereby, and

means connecting the looper shaft with the driving shaft and including a slide, a pair of rolls connected therewith and cam actuated means for shiftin said rolls and slide.

27. In a sewing mac ine, the combination of a driving shaft, a reciprocating and rocking looper shaft extending in parallelism with said driving shaft, one or more loopers carried thereby, and means for rocking and reciprocating said looper shaft and including separate means connected with the driv ing shaft, one of said means including a slide and a roll engaging cam for shifting it.

28. In a sewing machine, the combination of looper mechanism and driving mechanism, and means for driving said looper mechanism from the driving mechanism and including a pair of rolls and a cam actuated slide sliding in a straight path only.

'29. In a sewing machine, the combination of looper mechanism including one of more loopers working solely below the throat plate of the machine, and means for actuating said looper in a concave-convex path and including sliding and rotary means separately connected with the same source of power.

30. In a sewing machine, the combination of looper mechanism including one or more loopers, and means for actuating said looper in a concave-convex path and including a spherical eccentric, a slide and means for shifting said slide.

31. In a sewing machine, the combination of looper mechanism including one or more loopers, and means for actuating said 100 er or loopers in transverse paths, with its 01'- ward and return movements in different paths, and including a pair of rolls and a cam actuated slide and means for actuating said cam.

32. In a sewing machine, the combination of a driving shaft, looper mechanism including a looper and means connecting said looper with the driving shaft, and including a pair of conical cam rolls and a cam of variable thickness working between said rolls for always driving them in the same direction.

33. In a sewing machine, the combination of a driving shaft, a reciprocatin and rocking loopersha-ft located in parallelism with the drivin shaft, one or more loopers carried'there y and means for reciprocating and oscillating each of said loopers in a concave-convex path, and includin a pair of conic-a1 rolls and a cam of variab e thickness for operating the said rollsfor driving the same always in the same direction.

34. In a sewing machine, the combination of a driving shaft, a reciprocatin and rocking looper shaft located in paral elism with the driving shaft, one or more loopers carried thereby and means for reciprocating and oscillating each of said loopers in a concave-convex path, vand including a pair of conical rolls,a cam of variable thickness for operating the said rolls for driving the same always in the same direction, and a slide connected with said rolls and with said reciprocating looper shaft.

Signed at Utica, New York, this 14th day of December, 1912.

' JOHN P. WEIS. \Vitnesses:

' CHARLES A. TURNER, Enwm L. HQOKRIDGE. 

